Re: IS-IS reference

in general, i agree. except for a quibble

The backbone should not take _any_ routing information from the leaf networks.

there are cases where one has to: o multi-homed customers who need to speak bgp. yes, one could 'cheat' and not listen to their announcements and static route them. but it is easier to get the safety by buildin acls from the routing databases. (and don't start ranting on that one:-) o pops where one's local complexity is sufficiently high, or router management is delegated, so that ibgp or confederation are the most reasonable ways to partition into managable pieces (remember the business model which drives my life). randy